The Lacroixberg underground stone quarries date back centuries and although inter-connected, almost certainly originated as separate workings under different ownership. The area covered by the quarrying is estimated at up to 50 hectares.
The quarry is particulalry noteworthy for the extensive graffiti found on its walls. Some of this comprises dates and initials or symbols - probably indicating ownership or boundaries. Elsewhere are tally marks, which record the amount of stone removed from the quarry. In areas used later for mushroom farming, the inscriptions are related to this later product.
Years ago access to the quarry was freely available but the complex is now gated. This is partially to preserve the structure and graffiti but also to protect the large bat population that use the site as a roost. Visits for the local community are occasionally made available.